Metal Knight's Revenge

The boy who was sent to the universe in the 21st century returns, However, when he encountered the turbulence of time and space, he returned thirty thousand years later. The extreme development of science and technology caused humankind to perish for a time. When the surviving humans re-establish civilization, Technology from hundreds of centuries ago has long been tabooed by the world. This magical world is developing to the other extreme. Lear, who embarked on a journey to find the truth, vowed to use the so-called [black technology] at his disposal to Find out the truth behind the world's chaos.